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test_g1.cpp

@@ -0,0 +1,8 @@
+#include <iostream>
+
+int main() {
+	using namespace std;
+	cout << "Hello world" << endl;
+	return 0;
+}
+

test_isinf.cpp

@@ -0,0 +1,45 @@
+#include <iostream>
+#include <cmath>
+#include <stdint.h>
+#include <limits>
+
+using std::cout;
+using std::endl;
+
+static bool my_isnan1(double val) {
+	union { double f; uint64_t x; } u = { val };
+	return (u.x << 1) > 0x7ff0000000000000u;
+}
+
+static bool my_isnan2(double val) {
+	return val != val;
+}
+
+static bool my_isnan3(double val) {
+	volatile double a = val;
+	return a != a;
+}
+
+static void check_nan(double val) {
+	cout << "value: " << val << endl;
+	cout << std::isnan(val) << endl;
+	cout << ::isnan(val) << endl;
+	cout << __isnan(val) << endl;
+	cout << my_isnan1(val) << endl;
+	cout << my_isnan2(val) << endl;
+	cout << my_isnan3(val) << endl;
+}
+
+int main() {
+	double a = std::log(0.0);
+	cout << std::isinf(a) << endl;
+
+	double b = std::sqrt(-1.0);
+	check_nan(b);
+
+	double c = std::numeric_limits<double>::quiet_NaN();
+	check_nan(c);
+
+	return 0;
+}
+